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Compact multi-channel radio frequency pulse-sequence generator with fast-switching capability for cold-atom

Min Jiang1, Si-Bin Lu1, Yang Li1,2

  • 1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China.

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A new compact radio frequency (RF) generator enables fast switching for cold-atom interferometers. This device significantly improves performance for field-portable atomic interference applications.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Instrumentation and Measurement

Background:

  • Cold-atom interferometers are crucial for fundamental physics and emerging field applications.
  • Radio frequency (RF) generators are essential for controlling lasers and atoms in these devices.

Purpose of the Study:

  • To develop a compact RF generator for rapid frequency and amplitude switching of atomic-interference pulse sequences.
  • To enhance the applicability of cold-atom interferometers in field settings.

Main Methods:

  • Utilized a field-programmable gate array (FPGA) to control eight direct digital synthesizers (DDSs) for multi-channel RF signal generation.
  • Implemented a pre-loading method for DDS registers to eliminate data transfer during pulse sequence execution.

Main Results:

  • Achieved a frequency-switching time of 100 ns and a harmonic-rejection ratio of 40 dB.
  • Demonstrated a 38% contrast in atomic interference fringes when applied to a cold-atom-interferometer gyroscope.

Conclusions:

  • The developed compact RF generator offers fast switching and sweeping capabilities for RF signals.
  • This technology is beneficial for advancing field-portable cold-atom interferometers and related applications.